Request for input

As part of an engineering project, I am looking at the design of an automated traffic information system that expands traffic information into non-urban areas by using system equipped vehicles as sensors. The basic premise is that the system:

- measures traffic volume via stationary sensors (already being done)
- measures traffic volume via system equipped vehicles (somewhat new)
- provides route meanagement via in-vehicle systems (already being done, like FM traffic to your nav)
- provides route management via signal controls (expand on what is being done today)

My questions are:
- Are the four points of the premisse true? Should there be more?
- What else is important to a user of such a system? (user privacy issues come to mind, especially if your vehicle is feeding location/speed information back into the system)
- Is there a need to have mobile web (internet) access to the vehicle?
- Should such a system be expanded to include vehicle diagnostics by tying into the vehicle's on-board computer via the OBD-II connection (or other means?)

Any replies would be appreciated. Thanks.

The project is for a grad school class. I've posted a request for feedback on a couple of GPS related sites, but I wanted to get input from an informed user community like this site. Any comments, opinions, inputs would be appreciated. Thanks.